SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR

9

Servomotors with follow-up action, i.e. in which the position of the actuated member conforms with that of the controlling member

14

with rotary servomotors

F

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

15

FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL

B

SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR

13

Details of servomotor systems

02

Fluid distribution or supply devices characterised by their adaptation to the control of servomotors

04

for use with a single servomotor

Applicants:

GRAY, Charles, L., Jr.[US/US]; US (UsOnly)GOVERNMENT OF THE UNITED STATES OF AMERICA, as represented by THE ADMINISTRATOR OF THE U.S. ENVIRONMENTAL PROTECTION AGENCY[US/US]; 1200 Pennsylvania Avenue N.W.
Washington, District of Columbia 20460, US (AllExceptUS)

(EN)METHOD AND DEVICE FOR SWITCHING HYDRAULIC FLUID SUPPLIES, SUCH AS FOR A HYDRAULIC PUMP/MOTOR(FR)PROCEDE ET DISPOSITIF DE COMMUTATION DE FOURNITURES DE FLUIDE HYDRAULIQUE NOTAMMENT DESTINE A UN MOTEUR OU A UNE POMPE HYDRAULIQUE

Abstract:

(EN)A spool valve includes a first valve port (162, 174) coupled to a fluid source at a first pressure range, a second valve port (164) coupled to a fluid source at a second, lower, pressure range, and first and second output ports (168, 170) coupled to a hydraulic device. The valve includes a valve spool (182) configured to selectively channel fluid from the first and second valve ports (162, 164) to the first and second output ports (168, 170), respectively, while in a first position, from the second valve port (164) to both the output (168, 170) ports while in a second position, and from the second (164) and first (174) valve ports to the first and second output ports respectively, while in a third position, and a check valve (200) to permit one-way fluid passage from the second output port (170) to the first valve port (162). The valve may include an anti-reverse check valve configured to prevent fluid from flowing into the valve via the first output port.(FR)L'invention concerne un distributeur à tiroir cylindrique qui comprend un premier orifice de soupape (162, 174) couplé à une source fluidique à un premier niveau de pression, un second orifice de soupape (164) couplé à une source fluidique à un second niveau de pression, inférieur, et des premier et second orifices de sortie (168, 170) couplés à un dispositif hydraulique. La soupape comprend un tiroir (182) conçu de manière à canaliser de façon sélective le fluide des premier et second orifices de soupape (162, 164) des premier et second orifices de sortie (168, 170), respectivement, dans une première position, à partir du second orifice de soupape (164) vers les deux orifices de sortie (168, 170) dans une deuxième position, et à partir des second (164) et premier (174) orifices de soupape vers les premier et second orifices de sortie respectivement, dans une troisième position, et une soupape de retenue (200) permettant un passage de fluide unidirectionnel entre le second orifice de sortie (170) et le premier orifice de soupape (162). La soupape peut comprendre une soupape de retenue anti-retour conçue de manière à empêcher au fluide de s'écouler dans la soupape via le premier orifice de sortie.